What is a tempo run, and does it work?

A tempo run is a sustained run at about threshold pace. Older reviews favoured polarised or pyramidal training over threshold training, and the 2025 and 2026 network meta-analyses found no significant or definite difference.

By RunFast · Updated 13 October 2026 · 10 min read

A tempo run is a sustained run at about threshold pace, and research papers call the same session a threshold run.¹ One definition of that threshold is the maximal lactate steady state: the highest intensity at which lactate production and elimination are in equilibrium.² The pace is where sources part ways, because one review located 25 different lactate-threshold concepts, and two ways of estimating the fastest steady effort give somewhat different running speeds.^{2, 3}

Does a tempo run work? The evidence is mixed, and it compares whole training mixes rather than single sessions. An older meta-analysis of 3 trials in endurance-trained athletes favoured polarised training over threshold training on time-trial performance.⁴ A 2025 network meta-analysis of individual data from 348 recreational and competitive endurance athletes found no statistically significant difference between polarised training and any other distribution, and a 2026 Bayesian network meta-analysis found no other distribution definitely better than polarised training.^{5, 6} In 30 recreational runners, 10K gains with a middle-zone-heavy mix didn’t differ significantly from those with polarised training, and in 38 others, a mix with half its time in the middle zone brought similar improvements with 17% less training time.^{7, 8}

So treat a tempo run as one kind of hard session, not a required one and not a proven better one. Take its pace from a calculator rather than a rule of thumb, and keep most of your running easy, as in 80/20 running.

What a tempo run is

Tempo or threshold?

A 2022 review of the training of world-class distance runners lists a “threshold run (also called tempo run)”: a sustained run at moderate intensity, around half-marathon pace for those runners.¹ The same review lists “threshold intervals (also called tempo intervals)”: repeats of 3–15 min at around half-marathon pace or slightly faster.¹ In some world-class runners, threshold intervals are paced by blood lactate, with a target typically from 2 to 4.5 mmol/L.⁹

So in the research we found, tempo and threshold are two names for one kind of session, run either continuously or as intervals. Coaches and websites that treat a tempo run and a threshold run as different sessions are using a naming convention of their own, not a research finding. If someone gives you a “tempo” or a “threshold” session, ask what pace and length they mean.

What “threshold” means

Threshold has no single definition: a 2009 review located 25 different lactate-threshold concepts.² One of them, the maximal lactate steady state, is the highest intensity at which lactate production and elimination are in equilibrium.² Even estimates of that fastest steady effort differ by method: the maximal lactate steady state typically comes out at a somewhat lower running speed than critical power, another way of measuring it.³

The threshold still matters. In the same 2009 review, most studies reported strong correlations between lactate-threshold measures and endurance performance, particularly in running events, an association rather than proof of cause.² So a threshold pace is a useful estimate, not a fixed line.

One 2024 meta-analysis uses three zones set by two thresholds: zone 1 below the first ventilatory or lactate threshold, zone 3 above the second, and zone 2 between them.¹⁰ In it, threshold training means more than 35% of training volume in zone 2, with the rest split between zones 1 and 3.¹⁰

Does a tempo run work?

The research can’t isolate the benefits of a tempo run. The studies below don’t set a tempo run against no tempo run: they compare training intensity distributions, how training time is split across the three zones.

What the reviews found

The older reviews favoured polarised or pyramidal training over threshold training, while the 2025 and 2026 network meta-analyses found no significant or definite difference.^{11, 4, 5, 6} By performance level, the 2025 analysis found that competitive athletes may gain more VO2max (maximal oxygen uptake) with polarised training, and recreational athletes with a pyramidal distribution.⁵ In the 2026 analysis, lactate-threshold training ranked most likely to be the best model for VO2max, with a rank-1 probability of 65.4%, but that is a ranking, not a definite effect.⁶

What the trials in recreational runners found

In 30 recreational runners randomly assigned for 10 weeks, the between-thresholds group spent about 46/35/19 of its time in zones 1, 2 and 3.⁷ Both groups improved their 10K, by 5.0% with polarised training and 3.6% with between-thresholds training, and the difference was not significant.⁷ The authors still concluded that polarised training can stimulate greater training effects in recreational runners, though their main comparison was not significant.⁷

In 38 recreational runners randomly assigned for 8 weeks, a polarised group (77/3/20) was compared with a “focused” group (40/50/10).⁸ The focused group got similar improvements while training 17% less.⁸ In 48 well-trained runners, cyclists, triathletes and cross-country skiers over 9 weeks, polarised training brought the greatest improvements in most key endurance variables, and threshold and high-volume training didn’t lead to further improvements.¹²

The middle-zone groups in the two recreational trials spent 35% and 50% of their training in zone 2.^{7, 8} They tested a whole pattern of training, not one tempo run a week.

What top runners do

In 85 male elite-standard and world-class runners, followed over their first 7 years of training, easy runs and tempo runs were the activities linked to significant variance in performance.¹³ That is an association, and the authors stress that easy running was crucial, partly because of its contribution to total distance.¹³ In world-class runners, a typical threshold run lasted 20–50 min (7–15 km), and the session should not be extremely fatiguing.¹

How to apply it

To do a tempo run, warm up with easy running, run the threshold part at a steady, comfortably hard effort, and cool down easy.

Pace. Take your tempo run pace from a recent race result, for example with the Threshold row of the pace calculator, rather than from a heart-rate percentage or a fixed number of seconds off another race pace. Sources set the pace differently because they define the threshold differently, and even the methods for the fastest steady effort give somewhat different speeds.^{2, 3} Treat the result as a pace to run around, not a line, and ease off if the effort stops feeling controlled.

Length and form. No study here set a tempo length for recreational runners. Tempo run workouts come in two forms, and the research we found describes both in world-class runners.

If you are new to tempo runs, start well short of those durations and add time only while the session still feels controlled.

Where it fits. Make a tempo one of your hard days and keep the rest of the week easy; the guide to how much of your running should be easy covers the split, and the marathon training plan guide shows where hard sessions sit in a plan.

Where the evidence is thin or mixed

The reviews and trials compare how training time is split, not a weekly tempo run against none (in one 2024 meta-analysis, threshold training means more than 35% of volume in zone 2).¹⁰ The meta-analyses pooled endurance athletes, many of them competitive: the 2025 one included 150 recreational and 198 competitive athletes.⁵ The older meta-analysis pooled only 3 trials, and the 2018 review in runners drew on 16 studies: 6 observational reports, 3 case studies, 6 interventions and 1 review.^{4, 11}

The 2026 analysis ranked threshold training first for VO2max by probability, and high-intensity interval training first for time-trial performance, yet found no model definitely better than polarised training.⁶ The two trials in recreational runners are small and short: 30 and 38 runners, over 10 and 8 weeks.^{7, 8} The finding about tempo runs themselves is an association in 85 elite-standard and world-class men, not a trial.¹³

No study here set a tempo length, pace or frequency for recreational runners, and the 20–50 min figure comes from world-class runners.¹ This guide gives no heart-rate band for a tempo run, because we found no research to base one on. In practice, a tempo run is a reasonable hard session to include, but the research doesn’t show that it beats the alternatives.

Common questions

What is the difference between a tempo run and a threshold run?

In the research we found, none: a review of world-class runners’ training lists the “threshold run (also called tempo run)” and “threshold intervals (also called tempo intervals)".¹ Some world-class runners pace threshold intervals by blood lactate, typically 2–4.5 mmol/L.⁹ When a coach uses the two words for different sessions, ask what pace and length they mean.

How fast should a tempo run be?

About your threshold pace, which no single test pins down: one review located 25 lactate-threshold concepts, and two ways of estimating the fastest steady effort give somewhat different speeds.^{2, 3} Get an estimate from a recent race with the pace calculator, and treat it as a pace to run around.

How long should a tempo run be?

No study here set a length for recreational runners. In world-class runners, a typical threshold run lasted 20–50 min (7–15 km).¹ Start well short of that, warm up and cool down easy, and add time only while the effort stays controlled.

Tempo run or intervals?

In the 2026 network meta-analysis, high-intensity interval training ranked most likely to be best for time-trial performance and threshold training for VO2max, but these are ranking probabilities, and no model showed a definite advantage over polarised training.⁶ Neither has been shown to be better, so you needn’t choose: both can be hard days in a mostly easy week.

This guide is general information, not medical advice. If you have an injury, a health condition or are pregnant, ask a doctor or physiotherapist before changing how you train or eat.

Related guides

• 80/20 running: what the research says80/20 running means keeping most training easy. A 2024 meta-analysis found a small VO2peak advantage for polarised training, but small studies in recreational runners found no significant difference in performance.
• How a marathon training plan is builtA marathon training plan combines rising weekly distance, a long run, easy and hard running, lighter weeks and a taper. The research backs some of these parts and says little about how to combine them.
• 10K pace chart: pace and splits for your goal timeFind your goal time for the even pace and splits to run it, per kilometre and per mile, then see what the research says about pacing the start and the finish of a 10K.

Sources

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